Seeing his mother’s breasts sticking out of her shirt, Ken realises that he might need to be more careful with the book… or more loose?
Rushing back upstairs, he opens the book, to the page about females. Searching the pages, (Which seem to shift when he isn’t looking,) Ken finds the page he wants. The book says “Women have obvious signs of ageing, such as wrinkles and grey hair.” Ken tries something, and crosses out everything after the comma. Once his pencil rises, the page shifts, making it seem as though there was never anything there. He writes “Women have obvious signs of ageing. For every year past 21, they gain a cup size, and their hips, ass, and thighs grow similarly.”
The book shifts once more. He closes the book, and gets down to dinner.
He has a hard time focusing on eating, because his mom looks extremely different. Her hair is long, healthy and blonde, with breasts so large, Ken has trouble believing she can still stand up. Her hips and ass are so large, she looks comical. He’ll need to fix that. She looks exactly like how she did when her and dad were married.
He finishes dinner quickly, (Reassuring his mother that he’s just tired), and climbs back into his room. He removes his additions, (Now making girls stay 21 effectively forever), and gazes at his computer, filled with… less than wholesome pictures of not completely human girls… and not completely female girls…
He erases the “Female” from the title, and writes “Monster Girl”. The book whirs slightly, and the book flips itself to a whole new page… and he feels as though it’s… expectant?
Reading through the pages, Ken sees nothing out of sorts. “Monster girls have animalistic parts, with only the head/face, neck, and ventral side still human,” the first paragraph states, “and generally, though not necessarily, human-like hands.”
“Yeah, all that seems fine,” Ken says for some reason. He feels a sort of… appreciation? Coming from the book. “So the magical notebook is also psychic… makes sense”
He flips through the pages, making a few changes. “Monster Girls are generally submissive,” “Monster Girls are very libidinous, requiring sex or masturbation once per day,” stuff like that.